rustc: Don't lint about isize/usize in FFI
This lint warning was originally intended to help against misuse of the old Rust `int` and `uint` types in FFI bindings where the Rust `int` was not equal to the C `int`. This confusion no longer exists (as Rust's types are now `isize` and `usize`), and as a result the need for this lint has become much less over time. Additionally, starting with [the RFC for libc][rfc] it's likely that `isize` and `usize` will be quite common in FFI bindings (e.g. they're the definition of `size_t` and `ssize_t` on many platforms). [rfc]: https://github.com/rust-lang/rfcs/pull/1291 This commit disables these lints to instead consider `isize` and `usize` valid types to have in FFI signatures.
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4 changed files with 10 additions and 16 deletions
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@ -497,14 +497,6 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
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FfiSafe
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}
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ty::TyInt(ast::TyIs) => {
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FfiUnsafe("found Rust type `isize` in foreign module, while \
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`libc::c_int` or `libc::c_long` should be used")
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}
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ty::TyUint(ast::TyUs) => {
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FfiUnsafe("found Rust type `usize` in foreign module, while \
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`libc::c_uint` or `libc::c_ulong` should be used")
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}
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ty::TyChar => {
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FfiUnsafe("found Rust type `char` in foreign module, while \
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`u32` or `libc::wchar_t` should be used")
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@ -10,8 +10,10 @@
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#![deny(warnings)]
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pub struct Foo;
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extern {
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pub fn foo(x: (isize)); //~ ERROR found Rust type `isize` in foreign module
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pub fn foo(x: (Foo)); //~ ERROR found struct without
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}
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fn main() {
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@ -27,12 +27,11 @@ pub struct ZeroSize;
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pub type RustFn = fn();
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pub type RustBadRet = extern fn() -> Box<u32>;
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pub type CVoidRet = ();
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pub struct Foo;
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extern {
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pub fn bare_type1(size: isize); //~ ERROR: found Rust type
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pub fn bare_type2(size: usize); //~ ERROR: found Rust type
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pub fn ptr_type1(size: *const isize); //~ ERROR: found Rust type
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pub fn ptr_type2(size: *const usize); //~ ERROR: found Rust type
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pub fn ptr_type1(size: *const Foo); //~ ERROR: found struct without
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pub fn ptr_type2(size: *const Foo); //~ ERROR: found struct without
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pub fn slice_type(p: &[u32]); //~ ERROR: found Rust slice type
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pub fn str_type(p: &str); //~ ERROR: found Rust type
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pub fn box_type(p: Box<u32>); //~ ERROR found Rust type
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@ -55,6 +54,8 @@ extern {
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pub fn good8(fptr: extern fn() -> !);
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pub fn good9() -> ();
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pub fn good10() -> CVoidRet;
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pub fn good11(size: isize);
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pub fn good12(size: usize);
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}
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fn main() {
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@ -13,9 +13,8 @@
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mod xx {
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extern {
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pub fn strlen(str: *const u8) -> usize; //~ ERROR found Rust type `usize`
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pub fn foo(x: isize, y: usize); //~ ERROR found Rust type `isize`
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//~^ ERROR found Rust type `usize`
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pub fn strlen(str: *const u8) -> usize;
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pub fn foo(x: isize, y: usize);
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}
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}
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